media: radio-miropcm20: set bus_info to explicit name

Fill in bus_info with fixed name.

This fixes this compiler warning:

drivers/media/radio/radio-miropcm20.c: In function 'vidioc_querycap':
drivers/media/radio/radio-miropcm20.c:206:57: warning: '%s' directive output may be truncated writing up to 35 bytes into a region of size 28 [-Wformat-truncation=]
  206 |         snprintf(v->bus_info, sizeof(v->bus_info), "ISA:%s", dev->v4l2_dev.name);
      |                                                         ^~
drivers/media/radio/radio-miropcm20.c:206:9: note: 'snprintf' output between 5 and 40 bytes into a destination of size 32
  206 |         snprintf(v->bus_info, sizeof(v->bus_info), "ISA:%s", dev->v4l2_dev.name);
      |         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>

drivers/media/radio/radio-miropcm20.c

@@ -199,11 +199,9 @@ static int pcm20_setfreq(struct pcm20 *dev, unsigned long freq)
 static int vidioc_querycap(struct file *file, void *priv,
 				struct v4l2_capability *v)
 {
-	struct pcm20 *dev = video_drvdata(file);
-
 	strscpy(v->driver, "Miro PCM20", sizeof(v->driver));
 	strscpy(v->card, "Miro PCM20", sizeof(v->card));
-	snprintf(v->bus_info, sizeof(v->bus_info), "ISA:%s", dev->v4l2_dev.name);
+	strscpy(v->bus_info, "ISA:radio-miropcm20", sizeof(v->bus_info));
 	return 0;
 }